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🔧 Seal it like a pro, anywhere, anytime!
The OB1 Anthracite Multi-Surface Construction Sealant & Adhesive is a professional-grade hybrid polymer formula designed for superior bonding and sealing across diverse materials. It withstands extreme temperatures (-40°C to +120°C), is waterproof including underwater applications, and is eco-friendly with an odourless, solvent-free composition. Trusted for over 20 years, it delivers a flexible, durable finish ideal for construction, repair, and emergency use.









| ASIN | B08K24NG7Z |
| Best Sellers Rank | 251 in DIY & Tools ( See Top 100 in DIY & Tools ) 13 in Sealers |
| Brand | OB1 |
| Colour | Anthracite |
| Compatible Material | Aluminium, Fibreglass, Glass, Plastic |
| Container Type | Tube |
| Country Of Origin | Netherlands |
| Customer Reviews | 4.6 out of 5 stars 1,233 Reviews |
| Global Trade Identification Number | 05032822004473 |
| Included Components | 290ml Cartridge with Nozzle |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Item Type Name | Adhesive and sealant |
| Item Volume | 290 Millilitres |
| Item Weight | 515 Grams |
| Item form | Paste |
| Manufacturer | Siroflex Lte |
| Manufacturer Part Number | B1SCS290A |
| Material | Hybrid Polymer |
| Model Number | B1SCS290A |
| Number of Pieces | 1 |
| Other Special Features of the Product | Hybrid Polymer Technology |
| Special feature | Hybrid Polymer Technology |
| Specific Uses For Product | Construction, Repair |
| Specific uses for product | Construction, Repair |
| Tensile Strength | 265 Newtons Per Square Millimeter (N/mm2) |
| Unit Count | 515.0 gram |
| Viscosity Level | Low |
| Water Resistance Level | Waterproof |
K**S
⭐⭐⭐⭐⭐ Professional-Grade Sealant and Adhesive That Never Lets Me Down
⭐⭐⭐⭐⭐ Outstanding Sealant and Adhesive – My Go-To for Professional Use The OB1 Seal & Adhesive Black 290ml is one of the best all-round sealants and adhesives I’ve used. As a professional tradesperson, I need products that are reliable, easy to apply and built to last, and OB1 consistently delivers. It has excellent initial grab and bonds extremely well to a wide range of materials, even in situations where other products can struggle. The finish is neat, it tools nicely, and it cures to a strong yet flexible seal that stands up well to movement, moisture and changing weather conditions. One of the biggest advantages is its versatility. Whether I’m sealing, bonding or carrying out repairs, it’s often the first product I reach for. It also adheres well to slightly damp surfaces, making it particularly useful for emergency repairs. Pros: * Excellent bonding strength * Strong initial grab * Flexible, durable finish * Suitable for a wide range of materials * Performs well indoors and outdoors * Easy to apply and tool * Trusted for professional use The only minor downside is that, like most high-performance adhesives, it can be a little messy if you don’t apply it carefully. Taking your time gives a very clean, professional finish. Overall, this is an exceptional sealant and adhesive that has earned a permanent place in my van. Reliable, versatile and built to last—I’d highly recommend it to both professionals and DIY users.
C**K
My go to sealant 100%
Absolutely 100% amazing stuff. Did not let me down and know a shed staple, I always have some in stock. So versatile and in different colours.
J**D
Easy to use
Easy to use and did the job, time will tell if it lasts ten years
A**I
Excellent value and quality
Reliable and long lasting
G**M
OB1 Anthracite Multi-Surface Construction Sealant & Adhesive used to fix slate hearth
Used this to fix a slate hearth in place and seal any small gaps. Great product and a good match for the slate and fireplace.
A**.
good colour match for my windows trims
The anthracite colour is a spot-on match for modern grey trim, and it doesn't shrink or crack like some cheaper sealants do over time. It gives a really neat, professional finish and holds tight straight away, even if the surface is a bit damp when you apply it. It’s easily the most reliable thing I’ve used for sealing up gaps.
S**Y
Used to fill in gap between laminate flooring and skirting.
This sealant is a quality product. The colour matches the chart and was perfect for gap that needed filling. Shame they don't do it in a smaller tube as only used a very small amount and will probably be hard next time I go to use it.
D**N
Works well but tiny tubes
Shrinjflation has taken hold , tiny tubes at oroemium proces but it does work
Y**Z
Ok
Excelente producto, totalmente recomendado. Cumple perfectamente con lo que promete. La calidad es muy buena, llegó rápido y en excelente estado. Estoy muy satisfecho(a) con la compra y sin duda lo volvería a comprar. ¡Vale la pena!
S**N
Best on the market
The best sealant / adhesive on the market, love it. It will seal of fix most things
C**N
NO FUNCIONA
ES UNA VERGÜENZA EL VENDEDOR, NO ME FUNCIONO BIEN EL PRODUCTO Y NO QUISO HABERSE CARGO DE LA DEVOLUCIÓN NADA RECOMENDABLE Y LE TENÍAN QUE ECHAR DE AMAZON
P**.
Very strong but stays just slightly pliable where a little flexibility is appreciated.
High quality product. Professional grade. Strong adhesion properties but can be removed if needed. I used it in the automotive area to bond a metal bracket to glass.
Trustpilot
2 weeks ago
1 day ago